Call Routing Based on a Combination of the Construction-Integration Model and Latent Semantic Analysis: A Full System

Guillermo Jorge-Botana, Ricardo Olmos, Alejandro Barroso

Abstract

This study stems from a previous article [1] in which we found that a psycholinguistically motivated
mechanism based on the Construction-Integration (C-I) model [2,3] could be used for call classifiers in
systems based on Latent Semantic Analysis (LSA). In it we showed that with this model more robust
results were obtained when categorizing call transcriptions. However, this method was not tested in a
context of calls in audio format, where a voice recognition application would be involved. The most
direct implication of a voice recognition application is that the text to be categorized may be
impoverished and is subject to noise. This impoverishment normally translates into deletions and
insertions which are semantically arbitrary but phonetically similar. The aim of this study is to describe
the behavior of a complete system, with calls in audio format that are transcribed by a voice recognition
application using a Stochastic Language Model (SLM), and then categorized with an LSA model. This
process optionally includes a mechanism based on the C-I model. In this study different parameters
were analyzed to assess the automatic router's rate of correct choices. The results show that once again
the model based on C-I is significantly better, but the benefits are more remarkable when the utterances
are long. The paper describes the system and examines both the full results and the interactions in some
scenarios. The economy of resources and flexibility of the system are also discussed.